Well the new type of batteries now being shipped with all phones for some years do not have memory imprint or anything so you don't have to charge it to full and discharge or stuff...Infact you shud make sure your moto g never gets fully discharged becoz then its being reported that it just stop charging altogether and need special procedures to charge again
I think Motorola forgot to reserve the last 10 % of the battery before shutdown.......usually phones shut down with some charge still left in them to avoid deep discharge of batteries

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